Listeria monocytogenes is a pathogen of concern in food production environments because

• A. It frequently causes listeriosis among plant employees
• B. It cannot be destroyed by cooking or other lethality treatments
• C. It can form biofilms on food contact surfaces if not frequently cleaned
• D. It thrives in hot, dry conditions

Answer: (C)

Listeria monocytogenes forms biofilms on food-contact surfaces, which lets it persist in processing environments even after cleaning. A biofilm is a slimy, protective layer that sticks to equipment, drains, and conveyors, making bacteria harder to remove with routine sanitation. Because these biofilms can resist sanitizers, Listeria can linger and contaminate foods, especially ready-to-eat products, creating a ongoing risk to consumers. The ability to grow at refrigeration temperatures further increases the danger in cold storage and during handling. The idea that it commonly causes illness in plant workers isn’t the reason for heightened sanitation focus, and proper cooking and sanitation can destroy the organism when applied correctly. It does not thrive in hot, dry conditions; it prefers cool, moist environments.